Perhaps you should try some spelling variations:
hieu san » hieu van, hieu sau, chieu sang
ve triet » va trien, su triet
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
duc van » duc tan, duc manh, duc phan
minh vi » minh voi, dinh vi, minh va
vi ve » va ve, gi ve, ve ve
pham » phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach tu)) nang xa hoi. hieu san pham ((duc van) or (duc va)) minh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach tu)) nang xa hoi. hieu san pham ((duc van) OR (duc va)) minh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach tu)) nang xa hoi. hieu san pham ((duc van) or (duc va)) minh vi ve triet*.